| Autor: |
Barton DA; 1 University of Sydney, Sydney, NSW, 2006, Australia., Roovers EF; 1 University of Sydney, Sydney, NSW, 2006, Australia.; 2 Institute of Molecular Biology, Mainz, Germany., Gouil Q; 1 University of Sydney, Sydney, NSW, 2006, Australia.; 3 Centre for AgriBioscience, Department of Animal, Plant and Soil Sciences, School of Life Sciences, La Trobe University, Victoria 3086., da Fonseca GC; 1 University of Sydney, Sydney, NSW, 2006, Australia.; 4 Universidade Federal do Rio Grande do Sul, RS, Brazil; and., Reis RS; 1 University of Sydney, Sydney, NSW, 2006, Australia., Jackson C; 1 University of Sydney, Sydney, NSW, 2006, Australia., Overall RL; 1 University of Sydney, Sydney, NSW, 2006, Australia., Fusaro AF; 1 University of Sydney, Sydney, NSW, 2006, Australia., Waterhouse PM; 1 University of Sydney, Sydney, NSW, 2006, Australia.; 5 Queensland University of Technology, Brisbane, QLD, Australia. |
| Abstrakt: |
Viral infection triggers a range of plant responses such as the activation of the RNA interference (RNAi) pathway. The double-stranded RNA binding (DRB) proteins DRB3 and DRB4 are part of this pathway and aid in defending against DNA and RNA viruses, respectively. Using live cell imaging, we show that DRB2, DRB3, and DRB5 relocate from their uniform cytoplasmic distribution to concentrated accumulation in nascent viral replication complexes (VRC) that develop following cell invasion by viral RNA. Inactivation of the DRB3 gene in Arabidopsis by T-DNA insertion rendered these plants less able to repress RNA viral replication. We propose a model for the early stages of virus defense in which DRB2, DRB3, and DRB5 are invasion sensors that relocate to nascent VRC, where they bind to viral RNA and inhibit virus replication. |
